Fully-strange tetraquarks mostly show narrow fall-apart decay widths of O(10) MeV, with X(2300) possibly matching the 1S-wave 1^{+-} state at 2323 MeV and X(2500) the 1P-wave 0^{-+} state at 2481 MeV.
The Y(2175) State in the QCD Sum Rule
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abstract
We study the mass of the state Y(2175) of J^{PC} = 1^{--} in the QCD sum rule. We construct both the diquark-antidiquark currents (ss)(s_bar s_bar) and the meson-meson currents (s_bar s)(s_bar s). We find that there are two independent currents for both cases, and derive the relations between them. The OPE convergence of these two currents is sufficiently fast, which enables us to perform good sum rule analysis. Both the SVZ sum rule and the finite energy sum rule lead to a mass around 2.3+-0.4 GeV, which is consistent with the observed mass within the uncertainties of the present QCD sum rule. The coupling of the four-quark currents to lower lying states such as \phi(1020) turns out to be rather small. We also discuss possible decay properties of Y(2175) if it is a tetraquark state.
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Fully-strange tetraquarks: fall-apart decays and experimental candidates
Fully-strange tetraquarks mostly show narrow fall-apart decay widths of O(10) MeV, with X(2300) possibly matching the 1S-wave 1^{+-} state at 2323 MeV and X(2500) the 1P-wave 0^{-+} state at 2481 MeV.